1221352001 has 8 divisors (see below), whose sum is σ = 1227247680. Its totient is φ = 1215467568.

The previous prime is 1221351973. The next prime is 1221352007. The reversal of 1221352001 is 1002531221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221352001 - 2¹⁴ = 1221335617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1221352007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 280100 + ... + 284426.

It is an arithmetic number, because the mean of its divisors is an integer number (153405960).

Almost surely, 2^1221352001 is an apocalyptic number.

It is an amenable number.

1221352001 is a deficient number, since it is larger than the sum of its proper divisors (5895679).

1221352001 is a wasteful number, since it uses less digits than its factorization.

1221352001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5623.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 1221352001 is about 34947.8468721608. The cubic root of 1221352001 is about 1068.9242984380.

Adding to 1221352001 its reverse (1002531221), we get a palindrome (2223883222).

The spelling of 1221352001 in words is "one billion, two hundred twenty-one million, three hundred fifty-two thousand, one".